How to use time.h and math.h in nrf connect sdk?

[Krumita]

1)I want to use "mktime" and "localtime" in my nrf52840 code ,how do i include time.h file?

2)I am using math.h file , in prj.conf i define "CONFIG_NEWLIB_LIBC=y"  but I continuously  get error as below ,how do i resolve it?

error:

/usr/include/math.h:415:33: error: '_Float128' is not supported on this target

415 | # define _Mdouble_ _Float128

[Naeem Maroof]

Hello Krumita,

Thank you for contacting DevZone at NordicSemi.

I am not sure if we are on the same page or not, but here is what I did:

I started with hello-world sample for the nrf52840dk in the ncs v2.4.0.

I simply added:

#include <time.h>
#include <math.h>

and then I was able to use the functions defined within those headers.

To print the floating point numbers, I had to add following in the prj.config:

CONFIG_SFLOAT=y
CONFIG_CBPRINTF_FP_SUPPORT=y

I can also see there are other Kconfig options available related to the DSP and Floating points

(for example: CONFIG_FPU to enable and use the floating point unit)

Below you can see the code I have used and the output on 52840dk

BR,

Naeem

[Krumita]

1)I want to use "mktime" and "localtime" in my nrf52840 code ,how do i include time.h file?

and i get 

error:

/usr/include/math.h:415:33: error: '_Float128' is not supported on this target

415 | # define _Mdouble_ _Float128

error after adding math.h , what is reason for it.

[Naeem Maroof]

This is exact same query you have started in your original post.

I have responded to that that I can add time.h and math.h without any issue and use their functions. 

I have explained all steps in detail that how I did that starting from the name of the project and noting smaller changes like the project configs etc.

1) Can you replicate the steps which I have mentioned and see the output?

2) Kindly let let me know all the steps in detail to replicate the problem you are having

BR

[Krumita]

yes i have did it, but i found time.h from nrf connect sdk which does not have 'mktime' and 'localtime' function.I want to use time.h from "usr/include/time.h" which has this function.

I have attache my cmakefile and prj.conf, 

and after adding math.h i am getting error as above i mention

Fullscreen 8080.CMakeLists.txt Download

#
# Copyright (c) 2021 Nordic Semiconductor ASA
#
# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
#
cmake_minimum_required(VERSION 3.20.0)

find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})


# add_subdirectory(common)
# add_subdirectory_ifdef(CONFIG_BT_HCI host)
# add_subdirectory_ifdef(CONFIG_BT_SHELL shell)
# add_subdirectory_ifdef(CONFIG_BT_CONN services)
# add_subdirectory_ifdef(CONFIG_BT_MESH mesh)
# add_subdirectory_ifdef(CONFIG_BT_AUDIO audio)
# add_subdirectory_ifdef(CONFIG_BT_CRYPTO crypto)

# if(CONFIG_BT_CTLR AND CONFIG_BT_LL_SW_SPLIT)
#   add_subdirectory(controller)
# endif()

zephyr_include_directories(${ZEPHYR_BASE}/subsys/bluetooth)
# zephyr_include_directories(${ZEPHYR_BASE}

# Target name
project(repeater)

set(APP_FIRMWARE_VERSION 0x1BD)
set(CLIENT CLIENT_ILUMI)
set(BOOTLOADER_VERSION  0x106)

# Project root directory
set(PROJ_DIR ../..)

set(THIRD_PARTY ../../third_party)

# set(CMAKE_C_STANDARD 11)
# set(CMAKE_CXX_STANDARD 11)

set(RTC_SYNC_V2 0)

set(C_SRC

    ${PROJ_DIR}/app/src/main.c
    ${PROJ_DIR}/app/src/ilumi_pa_lna_assist.c
    ${PROJ_DIR}/app/src/mock_placeholder.c
    ${PROJ_DIR}/app/src/RTC.c
    ${PROJ_DIR}/app/src/i2c_nrf52.c
    ${PROJ_DIR}/app/src/timeout.c
    ${PROJ_DIR}/app/src/connect_notify.c
    ${PROJ_DIR}/app/src/rtc_func.c
    ${PROJ_DIR}/app/src/adv_timer.c
    ${PROJ_DIR}/app/src/internal_flash.c
    ${PROJ_DIR}/app/src/ilumi_app_timer.c
    ${PROJ_DIR}/app/src/ilumi_ble_app.c
    ${PROJ_DIR}/app/src/hal_uart.c
    ${PROJ_DIR}/app/src/ilumi_softdevice_handler_sdkv13.c
    ${PROJ_DIR}/app/src/uart.c
    ${PROJ_DIR}/app/src/uart_logf.c
    ${PROJ_DIR}/app/src/ilumi_api_type_define.c
    ${PROJ_DIR}/app/src/scene.c
    ${PROJ_DIR}/app/src/scene_predefine.c
    ${PROJ_DIR}/app/src/log.c
    ${PROJ_DIR}/app/src/OSAL_Nv.c
    ${PROJ_DIR}/app/src/ilumi_nv_data.c
    ${PROJ_DIR}/app/src/ilumi_user_data.c
    ${PROJ_DIR}/app/src/ilumi_recv_msg.c
    ${PROJ_DIR}/app/src/ilumi_common_msg.c
    ${PROJ_DIR}/app/src/ilumi_temp_compensation.c
    ${PROJ_DIR}/app/src/ilumi_circadian.c
    ${PROJ_DIR}/app/src/ilumi_api.c
    ${PROJ_DIR}/app/src/ble_stack_util.c
    ${PROJ_DIR}/app/src/user_interface.c
    ${PROJ_DIR}/app/src/ilumi_utility.c
    ${PROJ_DIR}/app/src/ilumi_timer_def.c
    ${PROJ_DIR}/app/src/ilumi_api_service.c
    ${PROJ_DIR}/app/src/ilumi_task_dispatch.c
    ${PROJ_DIR}/app/src/ilumi_user_action.c
    ${PROJ_DIR}/app/src/ilumi_uart_cmd.c
    ${PROJ_DIR}/app/src/ilumi_properties.c
    ${PROJ_DIR}/app/src/ilumi_mesh.c
    ${PROJ_DIR}/app/src/ilumi_mesh_config.c
    ${PROJ_DIR}/app/src/ilumi_special_effect.c
    ${PROJ_DIR}/app/src/ilumi_app_button_sdk13.c
    ${PROJ_DIR}/app/src/alarm_list.c
    ${PROJ_DIR}/app/src/alarm_manager.c
    ${PROJ_DIR}/app/src/color_util.c
    ${PROJ_DIR}/app/src/rtc_util.c
    ${PROJ_DIR}/app/src/time_util.c
    ${PROJ_DIR}/app/src/company.c
    ${PROJ_DIR}/app/src/ilumi_dfu_func.c
    ${PROJ_DIR}/app/src/ilumi_dfu_service.c
    # ${PROJ_DIR}/app/src/ilumi_queue.c
    # Source files from booloader section
    ${PROJ_DIR}/bootloader/src/bootloader_util_gcc.c

    ${THIRD_PARTY}/nrf_drv_gpiote.c
    ${THIRD_PARTY}/crc16.c
    ${THIRD_PARTY}/app_error.c
    ${THIRD_PARTY}/nrf_assert.c
    ${THIRD_PARTY}/app_util_platform.c
    ${THIRD_PARTY}/app_scheduler.c
    ${THIRD_PARTY}/nrf_drv_ppi.c
    ${THIRD_PARTY}/nrf_drv_pwm.c
    ${THIRD_PARTY}/nrf_drv_clock.c
    ${THIRD_PARTY}/nrf_drv_common.c
    ${THIRD_PARTY}/ble_flash.c
    # ${THIRD_PARTY}/nrf_drv_twis.c
    ${THIRD_PARTY}/nrf_drv_twi.c
    ${THIRD_PARTY}/nrf_drv_spi.c
    ${THIRD_PARTY}/ble_srv_common.c
    ${THIRD_PARTY}/ble_dis.c
    ${THIRD_PARTY}/ble_conn_params.c
    ${THIRD_PARTY}/softdevice_handler_appsh.c
    # ${THIRD_PARTY}system_nrf52.c
    
)

# C++ source files
set(CPP_SRC
    ${PROJ_DIR}/app/src/RouteCore.cpp
    ${PROJ_DIR}/app/src/routing_api.cpp
)
set(INCLUDE_DIR
    # /usr/include/x86_64-linux-gnu/bits
    ${PROJ_DIR}/app/repeater
    ${PROJ_DIR}/app/inc
    ${PROJ_DIR}/bootloader/repeater
    ${PROJ_DIR}/bootloader/inc
    ${THIRD_PARTY}
    /usr/include
)

# Header files from NRF Connect SDK

# Add source files to the target
target_sources(app PRIVATE
    ${C_SRC}
    ${CPP_SRC}
)

target_include_directories(app PRIVATE
    ${INCLUDE_DIR}
)

# target_compile_options(app PRIVATE
#     -Wno-unused-function
#     -Wno-unused-variable
#     -Wno-unused-but-set-variable
#     -mfloat-abi=hard
#     -mfpu=fpv4-sp-d16
#     -mcpu=cortex-m4
#     -mthumb
#     -mabi=aapcs
#     -DNRF52
#     -Wall
#     # -Werror
#     -fno-exceptions
#     -fdata-sections
#     -ffunction-sections
#     -g
#     -Os
#     -std=gnu99
# )


# target_link_options(app PRIVATE
#     -mcpu=cortex-m4
#     -mthumb
#     -mabi=aapcs
#     -specs=nano.specs
#     -specs=nano.specs
#     -Xlinker --cref
#     -Xlinker --gc-sections
#     -Xlinker --undefined=m_boot_settings
# )

add_definitions(-DREPEATER)
add_definitions(-DSDK_V13)
add_definitions(-DSDK_V11)
add_definitions(-DBLE_STACK_SUPPORT_REQD)
add_definitions(-D${CLIENT})
add_definitions(-DAPP_FIRMWARE_VERSION=${APP_FIRMWARE_VERSION})
add_definitions(-DENABLE_RTC)
add_definitions(-DUSER_DEFINED_COLOR)
add_definitions(-DDEBUG)
add_definitions(-DFDIN_SUPPORT)
add_definitions(-DNRF52)
add_definitions(-DNORDIC_PLATFORM)
add_definitions(-DNRF52840_XXAA)
# Set the ASM flags globally for all targets
add_compile_options(-DNRF_SD_BLE_API_VERSION=5)

2117.prj.conf

[Naeem Maroof]

Hello,

I am not sure whether we are on the same page or not.

I do not find any such folder /usr/include in the complete NCS folder.

If that is custom implementation, then it makes sense.

For such a case, I have created a custom library, it has a header file and a source file, very simple one just to show the functionality.

The library I called neolib is present at c:/ncs/third_party/

neolib has neolib.h and neolib.c files

Below you can see I am using the header file (neolib.h) in my project

I am using the function defined in it, and I can see everything is working good.

BR, 
Naeem